The surface and internal properties of the sheet metal used for stamping have a great impact on the quality of the stamping product. The thickness of the stamping material is required to be accurate and uniform; the surface is smooth, without spots, scars, scratches, and surface cracks, etc.; the yield strength is uniform and there is no obvious Directionality; high uniform elongation; low yield ratio; work hardening.
Stamping is mainly classified by process, which can be divided into two categories: separation process and forming process. The separation process is also called punching, and its purpose is to separate the stamping parts from the sheet along a certain contour line while ensuring the quality requirements of the separated section. The purpose of the forming process is to make the sheet metal plastically deform without breaking the billet to make a workpiece of the required shape and size. In actual production, multiple processes are often applied to one workpiece. Blanking, bending, shearing, deep drawing, bulging, spinning, and correction are the main stamping processes.
Cold stamping parts are generally no longer processed by cutting, or only a small amount of cutting processing is required. The precision and surface condition of hot stamping parts are lower than cold stamping parts, but still better than castings and forgings, and the cutting amount is less.
Stamping is an efficient production method. Using compound dies, especially multi-station progressive dies, multiple stamping processes can be completed on one press, and the whole process from strip uncoiling, leveling, punching to forming and finishing can be achieved. Automatic production. The production efficiency is high, the working conditions are good, and the production cost is low. Generally, hundreds of pieces can be produced per minute.